To feed on blood; to act like a parasite or exploit someone ruthlessly for money or resources.
Compound of 'blood' and 'suck.' The literal meaning applies to animals like leeches and mosquitoes; metaphorical use emerged for exploitative people.
Mosquitoes are nature's bloodsuckers—a single female can fill her body with blood twice her weight in just three minutes, making her one of earth's most efficient (and annoying) parasites.
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